TXC-06101AILQ Transwitch Corporation, TXC-06101AILQ Datasheet - Page 12

• Manufacturer Part Number: TXC-06101AILQ
• Manufacturer: Transwitch Corporation

Specifications of TXC-06101AILQ

• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Package Type: PQFP
• Rad Hardened: No
• Lead Free Status / Rohs Status: Not Compliant

Overhead Locations
The functions of the Section and Line Layers have been combined into a structure of 27 bytes called Transport
Overhead (TOH) which occupies the first three columns of an STS-1 Frame. The first three rows are Section
Overhead (SOH). The last six rows are Line Overhead (LOH). This is shown in Figure 8. In STS-N and Nc
frames there are 3 × N TOH columns. Figures
as an example. The byte-interleaved characteristic of SONET can be seen in these figures. Some of the trans-
port overhead fields in STS-1 numbers two through N are the same as for STS-1 number one and some are
not. In the STS-3 Format there are three H1 and H2 Bytes. Each H1, H2 combination is a pointer for one of the
three payloads that is being transported. The STS-3c format is carrying one
only one pointer. The H1 and H2 bytes in the STS-1 number one position are the pointer. The two remaining
H1 and H2 byte pairs in STS-1 positions two and three are the Concatenation Indicators.
The Path Layer functions are assigned to the nine bytes occupying the first column of the STS SPE. The dis-
tinction between TOH and POH is made so that transmission equipment can be specified without regard to the
information structure that is being transported. The STS-1 and STS-3c formats have only one POH field. In the
STS-3 format there are three POH fields, one for each payload. The shaded diagonals represent Pointer and
POH bytes associated with STS-1 numbers two and three.
Proprietary TranSwitch Corporation Information for use Solely by its Customers
STS-1
#
D10
A1
B1
D1
H1
B2
D4
D7
S1
1
Transport Overhead (First 9 Columns of STS-3 Frame)
A1
H1
B2
Z1
2
= Undefined Overhead Byte = 00000000
A1
H1
B2
Z1
3
Sync. Msg.
Datacom
Datacom
Datacom
Datacom
Framing
Pointer
BIP-8
BIP-8
D10
A1
B1
D1
H1
B2
D4
D7
S1
First Three Columns of STS-1 Frame
D11
A2
E1
D2
H2
K1
D5
D8
Z2
1
Figure 8. STS-1 Overhead
Figure 9. STS-3 Overhead
Transport Overhead
A2
H2
Z2
2
Orderwire
Datacom
Datacom
Datacom
Datacom
Framing
Pointer
FEBE
APS
D11
9
D2
H2
D5
D8
M0
A2
E1
K1
A2
H2
M1
3
and
- 12 of 196 -
C1/J0
D12
F1
D3
H3
K2
D6
D9
E2
DATA SHEET
1
10
STS-1# / Trace
Pointer Action
C1/Z0
Orderwire
Datacom
Datacom
Datacom
Datacom
H3
2
C1/J0
represent STS-N and Nc formats using STS-3 and 3c
User
APS
D12
F1
D3
H3
K2
D6
D9
E2
C1/Z0
H3
3
G1
J1
B3
C2
F2
H4
Z3
Z4
Z5
1
Path Overhead (3 x 1 Column)
First Column of SPE
Path Overhead
Tandem Conn.
Signal Label
Path Status
Multiframe
Growth
Growth
Trace
BIP-8
User
B3
C2
G1
H4
J1
F2
Z3
Z4
Z5
B3
C2
G1
H4
J1
F2
Z3
Z4
Z5
2
150 Mbit/s payload. There is
B3
C2
G1
F2
H4
Z3
Z4
Z5
J1
3
TXC-06101
Ed. 3, April 2001
TXC-06101-MB
PHAST-1